Bottom portion of a frame for use with a mask assembly in the application of continuous positive airway pressure (CPAP)



FIG. 1 is a front perspective view of a bottom portion of a frame for use with a mask assembly in the application of continuous positive airway pressure CPAP according to an embodiment of our design;

FIG. 2 is a front view thereof; and,

FIG. 3 is a bottom view thereof.

The dashed lines shown in FIGS. 1-3 disclose unclaimed subject matter, are for environmental purposes only, and thus form no part of the claimed design. The dotted lines shown in the Figures represent the borders between claimed subject matter and unclaimed subject matter and form no part of the claimed design. 

The ornamental design for a bottom portion of a frame for use with a mask assembly in the application of continuous positive airway pressure (CPAP), as shown and described. 